As a rule, I used a small mount of micro-balloons in every mixture of Hysol. Ran out about 6 months ago, and purchased a container from Spruce ... I have a lifetime's worth for a few $ (USD or CDN).
I looked for a photo during the riveting, but it was pretty messy with the Hysol (w/micro balloons) squeesing out which is probably why I wasn't handling the camera. So yes, the spar attachment shown has the standard mix of Hysol + balloons.
Re: Spar Attach Epoxy
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